Metal window construction



April 15, 1952 D. T. BJORK METAL wmuow CONSTRUCTION Filed April 7, 1948 4 Sheets-Sheet 1 FIG. I

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INVENTOR W o m J E B N I R T 0 T D A T w A D April 15, 1952- n. T. BJORK METAL wmnow CONSTRUCTION Filed April '7, 1948 4 Sheets-Sheet 2 FIG. 4

gafmiv ATTORNEYS April 15, 1.952 n. T. BJORK METAL wmnow cons'raucnon 4 Sheets-Sheet 5 Filed April 7, 1948 INVENTOR .DAVID T. BJORK ATTORNEYS A ril 15, 1952 D. 1'. BJORK 5 5 I METAL WINDOW CONSTRUCTION Filed April 7, 1948 4 Sheets-Sheet 4 FIG."

INVENTOR DAVID T. BJORK ATTORNEYS Patented Apr. 15, 1 952 UNITED STATES "PATENT OFFICE 1 1,593,0931 V f I METAL wmnow ooNs'raUornonf David T. Biol-k Evanston, Ill. Application April 7; 1948,.Serial No. 19,545

dows may be swung pivotedly in the window frame to permit easy access to the outside face of the window glass.

The main objects of this invention are to provide an improved sliding sash window construction; toprovide a window construction having improved. operating means for a pivoting sliding sash; toprovide an improved window sash having retractible guide rails to free the sash from the "frame in which it slides; to provide an improved pivot bolt arrangement for pivoting-sliding sash windows; and to provide an improved arrangement for simultaneous operation of retractable guide rails and extensible pivot bolts in sliding sash windows.

Further objects are to provide an improved sash construction for pivoting-sliding sash win.-

dows; to provide an improved construction for mounting pivoted-sliding sash windows; to provide an improved construction of retractable comma (o1. 189- 66) N inga modified arrangement for sealing the wine sash guide rails and pivot means whereby the window sash is at all times positively retained in the sash frame; to provide such a construction that is adaptable to either metal or wooden sash construction; and to provide an improved retractable guide rail and pivot means that may be readily applied to existing sliding sash windows.

Still further objects are to provide an improved arrangement for hanging pivoting sliding sash windows; and to provide such a construction in which the window sashes may be safely supported when swung on their pivots so -as to obviate the possibility of the window being dropped during thepivoting operation. 7

A specific embodiment of this invention is shown in the accompanying drawings in which:

Figure l is an inside face view showing the general appearance of the improved pivot-slide window construction.

Fig. 2. is a sectional elevation of the same. showing the pivoted positions of the window sashes iii-dotted outline.

Fig. 3,is a fragmentary sectional view. taken on line 3,.3 of Fig. 1, showing the arrangement and lower window sashes atthe parting railsj Fi 6'" is a fragmentary sectional detail showwindow frame head illustrating an arrangement ofspring actuated sash balancers for supporting dow sash parting rails.

Fig. 7 is a sectional view as taken on line 'i:-'l.

of Fig. 1, showing the construction and arrangementof the bottom window sash rail and the window frame sill member.

Fig. 8 is a fragmentary perspective view of the lower and right-hand portion of the window sash; partly broken away to show the pivotibolt and retractable guide rail operating mechanism. Fig.9 is a fragmentary perspective'detail view showing thearrangementiof the retractable guide rail operating element for the window sash. J

Fig. 10 is an inside face view of the operating handle,. showing its construction and operating.

arrangement.

Fig. 11. is a sectional view of the same as taken on line II-| l of Fig. 10.

Fig. 12 is a fragmentary face view of the win- .dow sash in elevation illustrating the operation of the retractable sash guide means and the.

pivot. the several, operative positions of the sash guide means and pivot being shown in dotted outline. a

Fig. 13 is a sectional plan view through the the sliding window sashes; and

14 is a fragmentary sectionalyiewas takenf on line l4;-l4, of Fig. 13 showing thej'sash cord locking arrangement for perm'ittingth'e sashes to be held inpivoted or inwardly swung position. i'

' In'the form shown inthe drawings'the invn;

tion is embodied in a doubleehung window sash arrangement whereina metal window frame and sash construction is employed- In this arrange other, ina frame 3, and disposedso asto be slid-j able vertically in parallel. spaced. planes in the same manner. as the ordinary double-hung slid.- ingsash windows.

type. of construction; and the window sashes 4 are made. of metal elements having a uniform cross. section throughout and arranged to fit into appropriate portions of the frame side members .so that they can be pivoted in the windowframe.

theupper and lower sashes-.inust be of difl'erent oven-all widths. whereby the] outermost window can pass the vertical stop for the inner window. In the construction shown, the upper window I islmadeof lesser width than. the lowerwindow 2, Since it is preferable that the upper sash be outer- The window frame 3, how-. ever, being made of metal, is of the hollow box.

most in order to have an adequate seal at the parting rails between the upper and lower sashes.

This arrangement of the sashes as well as the construction of the side members, or jambs, of the window frame is illustrated in Fig. 4, and, as shown, the jamb 5 is of hollow form constructed to fit into the window opening 6 of a building wall and is made with its face formed to provide three progressive steps, each lying in a different plane, with the highest step, relative to the window opening, being outermost. The two shoulders I and 8 thus formed between the steps, provide the stops forthe respective sashes of the windows I and 2 and the windows are mounted to slide on the respective steps between opposed jambs; it being understood that the opposite jamb and sash arrangement is the same as that shown in Fig. 4.

Each window sash is of the same construction, the only difference being in the relative widths, and in the form shown, the sash is made from metal top, side and bottom members suitably joined to form a rectangular frame. These frame members are all of the, same shape and section, to facilitate manufacture and assembly of the sashes, and referring to Fig. .4, it will be seen that the section is generally of 8 form to provide two oppositely opening channels 9 and Ill.

The inwardly opening channel 9 is defined by middle leg or partition II, between the channels.v

and by a short outer leg I2 which is preferably about one-half the height of the partition I I. The outwardly opening channel I is defined by the partition II and an outer leg I3 which is of sub? stantially the same height as the partition. The outer channel I0, however. is much narrower than the channel 9, being only about one-third the width of the latter, while the channel 9 has a width substantially equal to the height of the leg I2.

As shown, the jamb is formed to provide channels or grooves I4 and I5 positioned to align with the channels I0, of the respective sashes, when the sashes are in engagement with the respective stops I and 8, also each sash is provided with a tongue or guide rail I6 disposed in the channel I0 and projecting outwardly therefrom into the respective jamb groove. These tongues or guide rails are attached to the respective sashes and serve as means to hold the sashes in place in the window frame as well as runners on which the sashes slide up and down in the frame. The guide rails I6 are, however, only provided on the side members of the sash frames, as will hereafter appear, since their purpose is to engage the jambs and hold the windows in their normal slidable position 'between the jambs.

The tongues or guide rails I6 are slidably mounted in the respective channels I0, so as to be retractible thereinto by means of suitable operating means to be hereafter described and, in the form shown, are U-shaped members formed of sheet metal and arranged to closely fit the sash channels In and the respective jamb grooves I4 and I 5, so as to serve as weather strips as well as guide members. The legs of the U-shaped tongues extend into the channel I0 and bear resiliently against the sides thereof. These tongues extend substantially the height of the sash frame, being only slightly shorter for operational purposes, and are of a width equal substantially to the depth of the channel ID in order that they may be fully retracted to disengage the sash from the jamb. This arrangement and operation of the tongues I6 is shown in Fig. 12.

The construction of the frame head member and the arrangement of the upper sash frame 4 top member is shown in Fig. 3, and it will be seen that the head member II, like the jamb 5, is a hollow box-like form arranged to fit and extend 'along the top of the window opening. The back side of the head member is, however, closed by means of a plate I8, suitably secured, in order to provide an enclosure for sash balancer mechanisms which will be later described.

The front side of the head member I1 is generally level and flat since it normally'provides engagement only for the top member of the upper sash. However, one step I9 is formed in the front surface to provide a shoulder 20 to serve as a top horizontal stop for the upper sash. The step I9 and shoulder 20 are formed to correspond with the outer step and the shoulder 8 of the jambs and it will be understood that these portions of both the head member and the jambs are aligned in the assembled frame construction.

As shown in Fig. 3, the top member of the upper sash frame, indicated generally by 2 I. is of a construction identical with that of the side members of the sash frame shown in Fig. 4 and the outer leg I3 of the top member fits against the shoulder 20 when the sash is in closed position. The channel I0 of the top sash member serves in this case -to retain a suitable sealing member 22 adapted to protrude from the channel to engage the front face of the head member IT. The sealing member may or may not fill the channel It of the top member 2I as desired. As shown the sealing member 22 is a rubber strip set into the channel I0 and arranged to provide a weather seal between the head member I! and the upper window sash when the sash is in closed position.

The relation of the parting rails of the upper and lower sashes and an arrangement for sealing the space between them is shown in Fig. 5. These parting rails comprise the bottom member of the upper sash frame and the top member of the lower sash frame and these members are of the same size and shape as the side members of the sash frame, as before mentioned. However, since thesashes are disposed in different planes and some space is necessary between them, a suitable seal must be provided when the sashes are in closed position. One form of such a seal is shown in Fig. 5, and comprises a resilient clip 23 mounted on the bottom member of the upper sash frame and having an upwardly rolled edge 2 adapted to engage and resiliently bear against the upper member of the bottom sash frame. The clip 23 is astrip-like element which extends the length of the bottom member of the upper sash frame and is provided with a leg 25 which lies against the outer surface of the leg I2 of the said bottom member and is secured thereto by means of a clamping bar 26 held in place by suitable screws 21 which are threaded into tapped openings in the leg I2. The clip 23 may be made of any suitable resilient material, such as Phosphor bronze.

A modified arrangement for sealing the space between the sash parting rails is shown in Fig. 6 and in this case the sealing member comprises a rubber strip 28 seated in a channel strip 29 riveted, or otherwise secured on the leg I2 of the bottom member of the upper sash frame. Both the strip 28 and its mounting channel 29 extend the entire length of said bottom member and the width of the strip 28'is such that, when the sashes are in closed position, it will tightly engage the leg I3 of the upper member of the lower sash frame.

The construction of the window frame sill and v the relation of the bottom member-of the lower sash frame thereto is shown in Fig. '7. The sill 30, like the other window frame members, is also a hollow box construction of metal and is formed with stepped sash engaging surface.- The inner step 3|, however, is the highest and extends from the inside edge of the sill outwardly to a point substantially aligned with the channel I8 of the bottom member of the lower sash frame where they sill surface drops to form a shoulder 32 and thenseal between the lower sash and the sill 36 is provided by means of a gasket 33 of yiel'dable material, such as rubber, which is disposed in the,

channel I6 of the bottom member of the sash frame and arranged to project slightly therefrom to form a lip 34 which will yieldably engage the corner formed by the shoulder 32 and slightly overhang the same. Thus when thelower sash is in closed position against the sill 36 a secure weatherproof joint is provided.

Asindicated in Figs. 5 and 7 and the sash frame, there being one such pivot bolt on each side of each sash; These pivot bolts are arrangedto be projected laterally from the sides of the sashes and. into suitably located openingsin the window frame jambs, to provide pivot 'means for swinging the sashes inwardly when the sash tongues or guide rails. I6 are retracted from the jamb grooves.

Preferably the pivot bolt 35 and the tongues taneously by a singleoperatmg means mounted- I6 on both sides of each sash are operated simul on the bottom sash frame member. In this manner it is assured that either the tongues I 6 or. the pivot bolts35 will be engaged with the jarnbflto prevent accidental dropping or falling out of the window sash when it isdesired to swingthe sash in order to easily reach the outer window-pane surface.

The pivot bolt and retractible tongue construction is the same for each sash and the arrangement isthe same oneach side of the sasluexcepting only that one side is right hand and the other: left-hand, as will be readily understood- As shown in Figs. 8 and 12,-the pivot bolts-35 are disposed inthe channel 9 of the-bottom sash frame, member and are-arranged-foroperation by means of an operatin handle or lever-36 located at the center of, the bottom sash frame member.v These'pivot bolts are "arranged to slide laterally inthe' channel 9 and to be projected outwardly-through"suitably aligned openings 31 inv the sash sidefmemberspf'rom which. they enter suitable openings'notshown; in'thef window frame jamb 5.

.'In order to provide simultaneous operatioi'ifof the tongues I6 and the pivot bolts 35, aconnect as showhin Figs. Band 12, each of the'sashes is provided with a pivot bolt 35 disposed in the bottom member of 30 ing crank armarrangement,"mounted mule corner'of the sash frameQis utilized; This crank arrangement comprises a shaft 38 disposed transversely of the channel-9, in which the pivot slides, and having its inner end journaled in the partition II of the sash side frame inemberan'd its outer end supported and journaled in the corner plate 39 mounted in the corner of the, sash frame against the short inner legs I2. This 6. corner plate has a rectangular boss 40 which fits into the corner where the edges of the legs I2 meet and the journal is in this boss so that the axis of the: shaft 38 is outside of the relatively short legs I2 and intersects the partition II near the bottom of the groove II) in which the tongue I5 slides.

-As shown, a crank arm M is mounted fast on the inner end of the shaft 38 and is disposed centrally in the channel I0 of the sash frame side member where it extends between the legs of the tongue I6 and is pivotally connected, at its free end, to the tongue as at 42. Within the channel 3 of the bottom sash frame member and above the pivot 35, the crank shaft 38 is provided with a second crank arm 43 extending from a hub 44, secured on the crank shaft by means of a lock screw 45, into an opening 46 formed in the piv- 0t 35.

This arrangement is shown in detail in Fig. 9 and it will be seen that 'as the pivot is moved laterally-the motion will be imparted to the arm 43, so asto rotate the shaft 38, thereby swinging the arm 4I connected to the tongue I6 and caus- 1 ',.ing the tongue to shift in and out of its retaining grove In in the sash frame side member.

The several positions of the pivot 35 and the tongue I6 are illustrated in Fig. 12 where the full outline shows the tongue I6 in its operative or extended position when the bolt or pivot 35 is fully retracted. The dotted outline A, of the tongue I6, shows its fully retracted position at which position the pivot 35 is fully projected as at A The intermediate positions of the tongue and pivot are indicated by the dotted outlines B and 3;, respectively, and in those positions both the tongue and the pivot are partially projected from the sash and engaged with the jamb. This is the locking position of the elements wherein the sash is not-only keyed to the jamb but is also looked against vertical sliding movement, as when it is desired to lock the sashes in partly opened or fully closed positions. 7

As'shown in Fig. 12, the upper end of the tongue I6 is supported on a fixed pin 41, which extends across the channel In through an arcu-' leg I2 of the bottom frame member of the sashby means of a pivot 49 extending through the leg I2 and secured by a threaded connection with a The lever suitably tapped opening in the leg I2. 36 is backed by a shield plate 50 which serves the dual function of holding the lever firmly against the leg I2 and of hiding the lever position fromview from the outside of the window. The shield plate 50 is secured by means of bolts 5| which extend through the leg l2 from the inner side --thereof.

which extends through the legIZ and is threaded into the shield. The pinion 52 is driven by means of an arcuate rack 54, formed on the upper margin of an opening 55 provided in the lower end ofthe lever 36 and through which the pinion extends, and the pinion, in turn, drives a pair of rack bars 56 and 51 which are connected to the respective pivot bolts 35 by means of pins 58. The rack bars are positioned above and below the pinion, in vertical alignment, so as to operate in opposite directions upon rotation of the pinion and guided by slots 59 and 60 formed in the base portion of the shield 50. Thus, by operation of the lever 36 from one side to the other, the pivot bolts 35 are caused to be projected from the sides of the sash frame or retracted into the sash frame as the case may be. At the extreme positions of the lever 36, the pivot bolts are either fully extended or fully retracted; and at the mid position of the lever the pivot bolts are in their partially extended locking position.

It will be understood that a lifting handle 6! may also be mounted on the bottom frame member of the lower sash, as indicated in Fig. l, to facilitate raising and lowering the sash.

As before mentioned, it is preferred that the sashes be hung or supported from spring sash balancers housed in the window frame head member and. such an arrangement is shown in Fig. 13,.

wherein spring balancers 62 and 63 are provided for the respective sashes. Each spring balancer is mounted in the frame head I! on a vertical axis and the respective sash cords 64 and 65 extend from the balancer to the ends of the head where they pass downwardly, over suitable pulleys 65, to the uppers ends of the respective sashes where the cords are attached in notches formed in the sash frame. This arrangement of sash balancing means is well known in this art and will be readily understood.

The pulleys 65, however, are specially designed to provide a position locking or "lamping means for the sash cords so that when the sashes are swung open on their pivots the tension on the sash cord due to the balancers will be relieved. Such a sash cord clamping arrangement is shown in Fig. 14 wherein the pulley 65 is formed with a toothed or notched flange 67 and is horizontally journaled in a housing [it having a side opening 69 through which the cord can swing laterally. The side opening extends upwardly from the bottom of the housing 68 to a point substantially at the level of the pulley axis and terminates in a curved end 10 which extends outwardly parallel with pulley flange 61.

Thus, when the sashes are swung inwardly to their pivoted position, shown in dotted outline in Fig. 2, the sash cords 64 and 65 are pulled inwardly so that they extend at an angle across the pulley flange 61, and when the downward pull on the cords is released the cord is clamped by the flange notches against the end ID of the housing opening and held against the action of the respective balancer. Slotted openings H, at the ends of the head member ll, through which the cords pass, permit such inward angular pull on the cords.

It will now be seen that, with this arrangement for the sash cords, the sashes may be set to an inwardly swung position for cleaning purposes and safely retained in that position until it is desired to close them. When returning the sashes to their normal position in the window frame it is only necessary to pull downwardly on the respective sash cords and then push them to a vertical position where they are free of the notched pulley margins and will run freely over the pulley under the influence of the sash balancer.

.As shown in Figs. 3, 4, and 7, the window .panes are mounted in the sash frames by means of spring clips which set into the frame channels 9 and bear resiliently between the legs I2 and the window pane to press the same toward the partition ll of the sash frame section. The glass panes are set into the sash frames from the inner side and it will be understood that at least one dimension of the pane must be slightly less than the corresponding distance between the end edges of the inner frame section legs 12. The glass panes then rest against the partition portions ll of the sash frame and are sealed by means of an adhesive gasket 12, adapted to adhere to both the glass and the partition I l, which extends from end to end of the glass margin.

The mounting clips 73 are square U-shaped members made of a, stiff resilient material, such as Phosphor bronze, and are disposed with their legs extending into the sash frame channels 9 andtheir closed sides spanning the space between the glass pane and the le [2 of the sash frame. lhese mounting clips are formed to extend across the width of the frame opening and abut each other at the frame corners so as to completely close the opening between the leg I2 and the glass around the entire inner periphery of the frame.

Preferably the length of the mounting clip legs is such as to extend well into the channel 9 and at the same time provide ample bearing on the glass pane to hold it against the adhesive gasket 12 and, to secure the mounting clips in the desired position, laterally spaced pins 14 are provided to extend across the channel 9 through suitable openings in the mounting clip legs.

The normal operation of the improved pivotslide window sash is the same as with ordinary sliding sash windows, the jamb stops I and 8 and the tongues or guide rails l6 serving to seal the sliding jamb connection and retain the sashes within the window frame. During such normal operation the pivot bolts are fully retracted and the tongues 16 are fully extended. When it is desired to pivot the sashes, the operating lever 36 is swung to the left to retract the tongues and extend the pivot bolts and suitable openings, not shown, are provided at predetermined locations in the jambs to receive the bolts. Preferably the bolt openings for both sashes are 10- cated at the lower ends of the jambs, for consash are located at a higher level than the bolt openings for the lower sash. Thus when the sashes are positioned to align the pivot bolts with their respective jamb openings and the bolts are extended by the operating lever 36, the tongues are simultaneously retracted, clear of the jamb grooves, and the sashes may be swung inwardly.

In order to permit locking of the sashes in partly opened position, when in normal sliding engagement with the jambs, additional pivot bolt openings are provided in the jambs to receive the pivots at predetermined levels of the respective sash frame bottom members. Thus when the sash is shifted to the desired one of the predetermined partly opened positions, the operating lever 36 is shifted to its mid position where the pivot bolt is partly projected and the tongue 16 is only partly retracted, and the sash is securely locked in the window frame against any movement whatsoever.

The main advantages of the improved pivotslide sash arrangement reside in the simple con- .struction of the sliding tongue and extensible .pivotbolt mechanism whereby these devices are simultaneously operated to provide positive en- .-for access to the outer pane surfaces."

gagementof the sash with the window frame jamb atall times; and inthe arrangement of the mechanism so that item be readily utilized in either new orexisting sash constructions without altering their normal operation or seriously changing their mounting characteristics. I Otheradvantages are to be found in the imyproved sash construction which permits stand- 1 ardization of the sash frame members and results in lower manufacture and assembly costs; and in the'improved and simplifiedwindow pane mounting means whereby the installation or replacement of the glass in the sash frames may be done more .quickly and easily than with present i i .prising a sash frame having opposite side frame methods.

, Further advantages reside in the improved all metal construction of the window sashes and framesyand in the simplified jamb arrangement which provides a secure weather-tight mounting for the sashes and at the same'time permits them to be readily pivoted and swung inwardly Although but one specific embodiment 0f" this invention isherein shown and described; it will be understood that numerous details' of, the construction shown may be altered or omitted with- "out departing from the spirit of this invention as defined by the following claims.

- 1-.- A sl'iding sash window construction comprisadapted to be projectedlaterally from" eachof saidside frame members, means in ea-ch side frame member for shifting one'of said e'lements laterally relative to the resp'ective frame member,

and driving means connecting-said one element with the other element in each side frame'mem-J.

ber and adapted to simultaneously shift said other element in the direction opposite the movement of said one element.

2. A sliding sash window construction comprising a sash frame having opposite side frame members and a laterally projecting tongue element extending along each of said' side frame members, said side frame members each having a longitudinal channel adapted to receive and house the respective tongue element, each of said tongue elements being mounted in its respective channel and adapted to be slidably retracted thereinto, an axially slidable pivot pin element adapted to be projected laterally from each of said side frame members, driving means connecting the tongue and pivot pin elements of each side frame member and adapted to transmit motion from one element to the other in the opposite direction, and operating means extending between said side frame members and connected to one of the said elements of each side frame member for actuating both of the elements of both side frame members simultaneously.

3. A sliding sash window construction comprising a sash frame having opposite side frame members and a laterally projecting tongue element extending along each of said side frame members, said side frame members each having a longitudinal channel adapted to receive and house the respective tongue element, each of said tongue elements being mounted in its respective channel and adapted to be slidab'ly retracted thereinto, an axially slidable pivot p'inelement disposed adjacent the same end of each side frame member and adapted to be projected laterally beyond the outer margin thereof, means in' each sideframe member for shifting one of said elements laterally relative to the respective frame member, and driving means connecting said one element with the other element in each si'de frame member and adapted to simultane- --ously shift said otherv element in the direction soppo'sitethe movement of said one element. H

.4. A- sliding sash window construction-comchannel and'adapted to be slidably retracted thereinto; an axially "slidable pivot pin element disposed adjacent the same end of each side frame member and adapted to be projected laterally beyond the outer margin thereof, mo-

tion-transfer means operatively connecting each tongue with its respective pivot pin for simultaneous shifting of one by the other and in opposite directions relative to each other, and operating-means extending" between said side frame membersand. adapted to actuate the pivot pins of .both ,side members simultaneously.

-:5. ,Ayxsliding sash .window construction comprising a -sash frame having end members and oppositeside: members and an outwardly opening channel extending along each of said opposite side members,--a laterally shiftable tongue element disposed in andextending along each channel, each of said tongue elements being adapted to be projected from the respective channel and retracted into said channel, a laterally shiftable pivot pinelement housed within each end of one of the'end' members of said sash frame, each of saidpivot pin-elements being adapted to be extended from and retracted into said endmemher, and motion transfer means housed within each of the respective frame members and operatively connecting each tongue element with the respective pivot pin element for simultaneous shifting movement of one element by the other and in the opposite direction relative to the other.

6. A sliding sash window construction comprising a sash frame having top and bottom end members and opposite side members and an outwardly opening channel extending along each of said opposite side members, a laterally shiftable tongue element disposed in and extending along each channel, each of said tongue elements bein adapted to be projected from the respective channel and retracted into said channel, a laterally shiftable pivot pin element housed within each end of one of the end members of said sash frame, each of said pivot pin elements being adapted to be extended from and retracted into said end member, motion transfer means housed within each of the respective frame members and operatively connecting each tongue element with the respective pivot pin element for simultaneous shifting movement of one element by the other and in the opposite direction relative to the other, and common operating means mounted on said one frame end member and connected to one of the said elements of each of said side members for actuating the tongue and pivot pin elements of both side members simultaneously.

7. A sliding sash window construction comprising a sash frame having top and bottom end mem- .into said end member, motion transfer means housed within each of; the respective frame members and operatively connecting each tongue with its respective pivot pin for simultaneous shifting movement of the tongue by the pivot pin and in the opposite direction therefrom, and an operating means housed within said one end frame member and connected with each of the said pivot pins for actuating both said pivot pins in opposite directions relative to each other simultaneously.

8. A double hung sliding sash window construction comprising a window frame having opposed jambs each formed with transverse longitudinally extending steps providing a pair of transversely'spaced shoulders facing in the sam direction, the span between oneopposing pair of steps of said jambs being less than the span between the other opposing pair of steps, a longitudinal groove in each step of each jamb, a windown sash slidably mounted between each pair of opposing steps of the said jambs, a'laterally shiftable tongue projecting from each side of each sash, each tongue being aligned with and extending into a respective jamb groove, a pivot bolt mounted on each side of each sash and adapted to be projected laterally therefrom, said pivot bolts being axially aligned with each other and said jambs having openings to receive said pivot bolts, and operating means on each sash adapted to extend the tongues and retract'the pivot boltsw thereof simultaneously, each sash being swin'gable on its pivot bolts and away from the respective jamb shoulders when said pivot bolts are extended and said togues are retracted.

9; A double hung sliding sash window construc tion'comprising a, window frame having opposed jambs each formed with transverse longitudinal- 1y extending steps providing a pair of transversely spaced shoulders facing in the same direction, the span between one opposing pair of steps of said jambs being less than the span between the other opposing pair of steps, a longitudinal groove in each step of each jamb, a window sash slidably mounted between each pair of opposing steps of the said jambs, a laterally shiftable tongue porjecting from each side of each sash, each tongue being aligned with and extending into a respective lamb groove, a pivot bolt mounted on each side of each sash at one end thereof and adapted to beprojected laterally therefrom,

said pivot bolts being aligned with each other DAVID T. BJORK.

REFERENCES CITED The followingreferences are of record in the file of this'patent:

UNITED STATES PATENTS Number Name Date 729,665 Robbe June 2, 1903 911,454 Sjobring Feb. 2, 1909 1,045,869 McFarland Dec. 3, 1912 1,856,158 Gonder May 3, 1932 2,208,836 Edwards July 23, 1940 Kessler a June 5, 1945 

